Home > > > MIGS Glaucoma Surgery Harley Street: A Guide to Minimally Invasive Glaucoma Treatment

MIGS Glaucoma Surgery Harley Street: A Guide to Minimally Invasive Glaucoma Treatment

Author : Mr Minak Bhalla Private Ophthalmologist London | Published On : 02 Oct 2026

Glaucoma is a group of eye conditions that can damage the optic nerve and cause permanent loss of vision if it is not diagnosed and managed appropriately. Because glaucoma can progress without noticeable symptoms in its early stages, regular eye examinations and specialist monitoring are important.

For some patients, eye drops or laser treatment may be sufficient to control eye pressure. For others, surgery may eventually be recommended. One modern surgical approach is minimally invasive glaucoma surgery (MIGS).

Patients researching MIGS glaucoma surgery in Harley Street can access private ophthalmology clinics and consultant-led glaucoma services in one of London's best-known medical districts. MIGS encompasses a range of procedures and devices designed to lower intraocular pressure (IOP), often by improving the eye's natural drainage of fluid. TThe Royal College of Ophthalmologists

However, MIGS is not one single operation, and it is not suitable for every glaucoma patient. The most appropriate treatment depends on the type and severity of glaucoma, target eye pressure, existing medications, previous treatment and overall eye health.

What is MIGS?

MIGS stands for minimally invasive glaucoma surgery. It describes a group of procedures designed to lower intraocular pressure using small incisions, microscopic instruments or tiny implanted devices.

The underlying aim is to improve the drainage of aqueous fluid from the eye. When fluid does not drain adequately, pressure inside the eye can rise. In glaucoma, controlling this pressure can help reduce the risk of further damage to the optic nerve.

The Royal College of Ophthalmologists describes MIGS as a range of implants, devices and techniques that aim to reduce eye pressure by improving aqueous-fluid drainage. TThe Royal College of Ophthalmologists

Unlike traditional glaucoma operations, which can involve creating a new drainage pathway or using a drainage implant, many MIGS procedures work through the eye's existing drainage pathways.

There are several different MIGS technologies. Examples used in specialist practice include iStent, Hydrus, OMNI and other approaches. The Royal College's professional MIGS training programme lists several of these technologies, reflecting the range of procedures available within the field. IiHub

Why is controlling eye pressure important?

Glaucoma can damage the optic nerve, which transmits visual information from the eye to the brain. Once established glaucoma-related optic nerve damage occurs, it cannot simply be reversed.

Treatment therefore focuses on preventing or slowing further damage.

Reducing intraocular pressure is an important part of glaucoma management for many patients. Depending on the individual situation, treatment can include prescription eye drops, laser treatment and surgery.

The goal is not necessarily to achieve the lowest possible eye pressure. Instead, your ophthalmologist will establish a target pressure appropriate for your particular eyes and level of glaucoma.

This is one reason why a detailed specialist assessment is essential before considering MIGS.

Who may be suitable for MIGS?

MIGS is generally considered for selected patients with glaucoma, particularly certain patients with open-angle glaucoma. Some MIGS procedures are also commonly performed alongside cataract surgery.

Suitability depends on several factors, including:

  • The type of glaucoma

  • The severity of optic nerve damage

  • Your current eye pressure

  • Your target eye pressure

  • Response to glaucoma medication

  • Tolerance of eye drops

  • Previous glaucoma treatment

  • The anatomy of the eye

  • Whether cataract surgery is also required

MIGS is not necessarily appropriate for advanced glaucoma where a very substantial reduction in eye pressure is required.

Evidence and guidance also recognise that different glaucoma operations have different levels of pressure-lowering effectiveness and risk. NICE material on newer glaucoma procedures notes that MIGS procedures can form part of the range of surgical options available, with traditional glaucoma surgery remaining important for patients whose disease requires greater pressure reduction. NNice

Your consultant ophthalmologist can explain whether MIGS is a realistic option in your particular case.

MIGS and cataract surgery

One of the most important features of MIGS is that certain procedures can be performed at the same time as cataract surgery.

If a patient has both a cataract and glaucoma, combining cataract surgery with a suitable MIGS procedure may allow the surgeon to address both conditions during the same surgical episode.

This does not mean that every cataract patient with glaucoma requires MIGS. The decision depends on the severity of the glaucoma, pressure control, medications and other clinical factors.

A Harley Street glaucoma consultation can therefore be particularly useful for patients who have been diagnosed with both cataracts and glaucoma and want to understand their surgical options.

What happens during a MIGS assessment?

Before recommending MIGS, your ophthalmologist will carry out a comprehensive assessment.

This may include measuring your intraocular pressure, examining the optic nerve and assessing your visual field. Imaging such as optical coherence tomography (OCT) may also be used to assess the retinal nerve fibre layer and other structures.

Your consultant may also examine the drainage angle of the eye to determine whether a particular MIGS procedure is technically suitable.

Your history of glaucoma treatment is equally important. Your ophthalmologist may ask about:

  • Which eye drops you use

  • How frequently you use them

  • Whether you experience side effects

  • Your previous eye-pressure measurements

  • Previous laser or surgical procedures

  • Family history of glaucoma

  • Other eye conditions

This information helps your surgeon determine whether continuing medical treatment, laser treatment, MIGS or another surgical procedure is appropriate.

What are the different types of MIGS?

MIGS is a broad category rather than a single technique.

Trabecular micro-bypass procedures

Some MIGS devices are tiny stents designed to improve drainage through the eye's trabecular drainage system.

iStent is one example of a trabecular micro-bypass technology. Hydrus is another device designed to improve aqueous outflow through Schlemm's canal.

The Harley Street Eye Centre, for example, currently describes iStent and Hydrus as micro-stent options for selected open-angle glaucoma patients. TThe Harley Street Eye Centre

Canal-based procedures

Other MIGS approaches use instruments to improve the function of the eye's natural drainage pathway.

Procedures involving canaloplasty or trabeculotomy may be used to enhance aqueous outflow without creating the type of external drainage pathway associated with traditional trabeculectomy.

The exact procedure offered will depend on the surgeon's expertise, the available technology and, most importantly, whether it is appropriate for your eye.

Other MIGS technologies

The MIGS field continues to include several different devices and surgical approaches. The Royal College of Ophthalmologists' MIGS training programme currently includes technologies such as iStent, Hydrus, OMNI, ELIOS, iTrack and others. IiHub

This variety highlights why the term "MIGS" should not be treated as a single treatment with identical results and risks.

What are the potential advantages of MIGS?

For appropriately selected patients, MIGS may offer several potential advantages.

The procedures are generally designed to minimise tissue disruption compared with some traditional glaucoma operations. Depending on the procedure, MIGS may also have a favourable recovery profile.

Another potential benefit is reducing the patient's dependence on glaucoma medication. However, MIGS does not guarantee that a patient will be able to stop using eye drops.

The amount of pressure reduction achieved varies between procedures and patients.

The Royal College of Ophthalmologists emphasises that patients should be given information about the specific MIGS treatment being considered and how it may benefit them. TThe Royal College of Ophthalmologists

What are the risks of MIGS?

Although MIGS is designed to be less invasive than some traditional glaucoma operations, it is still eye surgery and carries potential risks.

The risks depend on the specific procedure. Possible complications can include inflammation, bleeding within the eye, temporary changes in eye pressure, damage to eye structures, infection and the need for additional treatment.

There is also a possibility that the pressure reduction achieved may not be sufficient to reach the patient's target eye pressure.

For this reason, MIGS should not be presented as a guaranteed alternative to glaucoma medication or conventional surgery.

A consultant ophthalmologist should discuss the expected benefits, limitations and risks of the particular MIGS procedure being considered.

What is recovery like?

Recovery depends on the procedure and whether MIGS is performed alongside another operation, such as cataract surgery.

Your surgeon will provide specific instructions regarding eye drops, physical activity, driving and follow-up appointments.

Glaucoma surgery requires monitoring after the procedure because eye pressure can change during the recovery period. Your ophthalmologist may adjust medications or recommend additional treatment depending on how your eye responds.

Following your post-operative instructions and attending scheduled appointments are important parts of achieving the best possible outcome.

MIGS compared with traditional glaucoma surgery

It is useful to understand that MIGS and traditional glaucoma surgery are not simply competing versions of the same treatment.

Traditional procedures such as trabeculectomy and glaucoma drainage-device surgery can achieve substantial reductions in eye pressure and remain important options for patients with more advanced or difficult-to-control glaucoma.

MIGS generally aims to provide a less invasive approach for appropriately selected patients, but its pressure-lowering effect may be more modest.

NICE specialist information describes MIGS as a group of newer procedures that are typically used in selected circumstances and notes that traditional trabeculectomy remains an important option, particularly for severe or uncontrolled disease. NNice

Your consultant should explain why one approach is being recommended over another rather than assuming that a newer procedure is automatically the right choice.

Choosing a MIGS glaucoma specialist in Harley Street

Patients looking for MIGS glaucoma surgery in Harley Street have access to a number of ophthalmology practices and specialist eye clinics in the area.

For example,The Harley Street Eye Clinic is located at 86 Harley Street, whileThe Harley Street Eye Centre - Laser Eye Surgery London operates at 22A Harley Street.Clinica London is also located at 140 Harley Street.

When choosing a glaucoma specialist, however, location should be only one consideration.

Look for a consultant with relevant glaucoma and surgical experience. Ask which MIGS procedures they perform and how they determine suitability.

It is also sensible to ask:

  • What type of glaucoma do I have?

  • What is my target eye pressure?

  • Why is MIGS being recommended?

  • Which MIGS procedure is being considered?

  • Could medication or laser treatment remain appropriate?

  • Would MIGS be combined with cataract surgery?

  • What reduction in medication might realistically be expected?

  • What are the risks in my particular case?

  • What happens if MIGS does not reduce pressure sufficiently?

  • What follow-up care is included?

These questions can help you understand the treatment rather than simply choosing a procedure based on its name.

Is MIGS right for you?

MIGS represents an important development in modern glaucoma surgery, providing selected patients with less invasive surgical options for lowering intraocular pressure.

However, glaucoma is a highly individual condition. The appropriate treatment depends on the type and severity of glaucoma, the level of eye pressure, the health of the optic nerve, previous treatment and your personal circumstances.

For patients considering MIGS glaucoma surgery in Harley Street, a consultation with a suitably qualified glaucoma specialist is the best way to establish whether a minimally invasive procedure is appropriate.

A thorough assessment can identify your current level of glaucoma, establish a target eye pressure and compare medication, laser treatment, MIGS and conventional surgery where relevant.

The aim of glaucoma treatment is ultimately to protect the remaining function of the optic nerve and preserve useful vision over the long term. MIGS may form an important part of that treatment strategy for appropriately selected patients, but the most suitable approach should always be based on an individual clinical assessment.